Monroe Shocks & Struts Suspension Shock Absorber P/N:66878

Smooth out the ride and help reduce excessive vibration on hardworking class 3-6 commercial trucks and buses with the Monroe Magnum Suspension Shock Absorber 66878. This gas-charged unit installs in the front or rear suspension position and is built to handle the demands of high-mileage, severe-use service on rigs like the 1968-1989 Chevrolet C50 and C60, the 1980-1989 GMC C5000/C6000/C7000, the 1987-2022 Kenworth T800, the 1981-2022 Kenworth W900 and the 2013-2024 Peterbilt 579 — see the Buyer's Guide tab for the full list of 39 applications.

• Nitrogen gas-charge: maintains tire-to-road contact by reducing aeration and shock fade for improved ride and handling.
• 10-stage valving: tuned to each vehicle, while a larger 1-3/8-in. bore provides more efficient damping control on most applications.
• All-weather fluid: special additives assist with extreme temperatures and help reduce oil breakdown, and a 2-in. or 2-1/4-in. reserve tube holds more fluid when required.
• Strong and durable: a shouldered bushing and bonded bushing with sleeve protect against bushing walkout, with arc welds up to 360° for durability.

A PTFE-coated bearing reduces friction between the rod and rod guide and a nitrocarburized piston rod supports longer service life on most applications, while a robust hydraulic lock-out helps prevent over-extension and piston top-out. Backed by Monroe's 90-day Risk Free Ride Offer and Limited Commercial Warranty.